US2654686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stiffened honeycomb core
Assignee: Northrop Grumman Corp
•
Filing: 1950-05-11
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Granted: 1953-10-06
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Expires: 1970-05-11
Abstract
No abstract record available.
Inventors
- 👤 Otto A Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:42
CPC Classifications
B; B64; B64C; B64C1/00; B64C1/06; B64C1/12; B29; B29C; B29C53/00; B29C53/02; B29C53/04; B29C67/00; B29D; B29D24/00; B29D24/002; B29D24/005; B31; B31D; B31D3/00; B31D3/02; B31D3/0292; B32; B32B; B32B3/00; B32B3/10; B32B3/12; E; E04; E04C; E04C2/00; E04C2/30; E04C2/34; E04C2/36; E04C2/365; B64C2001/0054; B64C2001/0072; B64C2001/0081; Y; Y02; Y02T; Y02T50/00; Y02T50/40; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49879; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24165
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-05 | 1957-04-06 | 1957-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-05 | 1961-04-06 | 1961-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-05 | 1965-04-06 | 1965-10-06 | $7700.00 | Window Closed / Lapsed |